论文标题
调查对暗物质Subhalos作为Fermi-lat的扩展来源的检测
Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT
论文作者
论文摘要
结构形成的冷暗物质（DM）模型预测了银河系中存在DM Subhalos。在DM的标准范式中，预计Subhalos将在伽马射线中大放异彩，并提供可检测到电流仪器的信号，特别是在Fermi〜卫星上的大面积望远镜（LAT）。这是搜索DM信号的主要动机，用于矮球星系和身份不明的费米 - 拉特来源。从位于相对较高纬度的非相关来源检测到的显着角延伸被认为是识别DM Subhalos的“吸烟枪”签名。在目前的工作中，我们通过银河系中冷DM光晕的最新模型系统地探索，这是用费米 - 拉特（Fermi-Lat）扩展的Subhalos的可检测性。我们模拟了DM信号，探讨了银河系和DM谱中Subhalos分布的不同假设，并通过现实的费米LAT分析管道重建其通量。在最乐观的情况下，我们表明，可以检测到nihihilation subhalos的检测高于$ 3 \ $ 3 \ times 10^{ - 26} $ cm $^3 $/s（对于100 GEV DM群众）（对于100 GEV DM群众），仍然与现有的Gamma-ray约束物，以及该案例的广泛范围（VS）的广播（VS）的范围很重要（VS）。相反，对于Fainter信号，Halos不仅没有显示出明显的扩展，而且它们甚至没有像点状的来源那样显着检测到。
Cold dark matter (DM) models for structure formation predict that DM subhalos are present in the Galaxy. In the standard paradigm of DM as weakly interacting massive particle, subhalos are expected to shine in gamma rays and to provide a signal detectable with current instruments, notably with the Large Area Telescope (LAT) aboard the Fermi~satellite. This is the main motivation behind searches for DM signals towards dwarf spheroidal galaxies and unidentified Fermi-LAT sources. A significant angular extension detected from unassociated sources located at relatively high latitudes is considered a "smoking gun" signature for identifying DM subhalos. In the present work, we systematically explore, by means of state-of-the-art models of cold DM halos in the Galaxy, the detectability of extended subhalos with Fermi-LAT. We simulate a DM signal exploring different assumptions of subhalos distribution in the Galaxy and DM profile, and reconstruct its flux through a realistic Fermi-LAT analysis pipeline. In the most optimistic case, we show that a detection of extended DM subhalos can be made for annihilation cross sections higher than $3 \times 10^{-26}$ cm$^3$/s (for a 100 GeV DM mass), still compatible with existing gamma-ray constraints, and that, in this case, the preference for extension of the source (vs point-like hypothesis) is significant. For fainter signals, instead, halos not only do not show significant extension, but they are not even detectable significantly as point-like sources.
